Friction draw-gear.



I. M. SNYDER.

PRIGTION DRAW GEAR.

APPLIOATION 111.1111 JULY 21. 1909.

Patented Sept. 13,1910.

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t fm 1 /l mw Q WN Q N m NN WW 1 FRANK M. SNYDER, 0F CRESSON,PENNSYLVANIA.

FRICTION DRAW-GEAR.

Specification of Letters Patent.

Patented Sept.. 13, 1910.

Application led July 21, 1909. Serial No. 508,849.

To all whom 'it may concern: r

Be it known that 1, F RANK M. SNYDER, a citizen of the United States,residing at Cressom-in the county of Cambria and State 'of Pennsylvania,have invented certain new and useful Improvements in Friction Draw-Gears, of which the following is a specification.

The present invention relates to draw gears for railway or motor carsand other structures, and the object is to provide an exceedinglycompact mechanism which produces an enormous amount of frictionalresistance to the movement of a draw-bar, said resist-ance increasing inproportion to the increase in the amount of movement of the draw bar.

The preferred embodiment of the invention is illustrated' in theaccompanying drawings, wherein Figure 1 is a longitudinal sectional viewthrough the structure illustrating a part of the draw gear. Fig. 2 is afront end view of the same, with the draw gear removed. Fig. 3 is a sideelevation of the core with one of thesections thereof removed. Fig. 4 isan end View of the said core. Fig. 5 is a detail sectional viewthroughone of the compressible friction rings. Fig. 6 is an end View ofthesame. Fig. 7 is an end view of one of the expansible rings. Fig. 8 isa sectional view therethrough.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

Int the embodiment disclosed, a tubular, and preferably cylindricalfriction case 9 is employed, the rear yend 10 of which abuts against theusual stationary follower block 11 ofla draft gear, and in practice afilling block as fills the space between said block 11 and one end ofthe yoke 36 hereinafter referred t0. The other end of the friction caseis open. Arranged longitudinally and centrally within this friction caseis an expansible core 12, which, as illustrated in Figs. 3 and 4, iscomposed of a series of sections 13. This core has a central bore 14 andend counterbores 15, the inner terminals of which are tapered, as shownat 16. A bolt 17 extends longitudinally through the bore` andconnterbores, and supports a pair of reversely disposed friction-producing cones 18 that bear against the ta )ered walls 16 of theVcounterbores. A' coiled spring 19, arranged upon one end of the bolt 17,bears against the adjacent cone 18, and also against a suitable, nut andwasher 20 threaded upon the bolt. A supporting plug 21 bears against theouter end f the other cone 18, and has its outer portion formed into acasing 22 that receives another coiled spring 23. This spring 23 bearsagainst the casing and against the head 24 of the bolt and acts as abalancing or equalizing means for the con1- panion spring 1S).

Surrounding the core and arranged within the casing, are a series ofcoacting expansible and compressible sectional rings, designatedrespectively 25 and 26, all of these rings, as shown in Figs. 5-8inclusive, being formed of sections, said rings having complementalinclined faces 27 that slidably bear yagainst each other. An innerexpansible sectional ring 28 disposed at the inner end of the series,has a right angularly disposed inner face,lagainst which the buffersprlngs 29 and 30 bear, these springs surrounding the core, and alsobearing against the inner end wall of the friction case. An outersectional ring 31 is employed at the outer end of the series, and has aninclined rear face 32 that co )crates with the ad jacent inclined face othe associated compressible ring 26. The movable follower' plate 33 ofthe draw gear is arranged to abut against the outer end of the rin 31.and also against the adjacent end o the bolt 17, if sufficient movementis given to the draw gear. The ring 31, as illustrated more particularlyin Fig. 2, is made of sections, which are loosely dovetailed together,as shown at 34, so that this ring can expand against the case 9. Aortion only of the draw gear is illustrate the said portion consistingof a part of the draw bar, which is designated 35, and to which issecured the end of the draw gear yoke 36, said yoke being disposedlongitudinally of and surrounding the friction case 9.

The operation of the structure is substantially as follows. Upon theinward movement of the draw gear, the follower plate 33 will strike theoutermost ring 31, and inasmuch as the sections of the compressiblerings are separated, said sections will be forced inwardly intofrictional engagement with the core 12, while the friction rings 31, 2aand 2 8 will be expanded and forced into frictional engagement with thecasing 9. These various operations, as will be obvious, produce a greatamount of frictional resistby movement of the drawbar It will thus beseen that inv the operation of l the rigging amost powerful frictionalbuffer action is accomplished by reason of the lopposing movements ofthe central expansible core 12 and of the sectional compressible rings26. In this connection it will be observed that the inward longitudinalthrust of the yoke not only serves to expand the elements 31, 25 and 28outward into frictional engagement with the casing 9, but alsocauses-thecompression element-s or sectional rings 26-26 to be'compressed about and upon the core 12, while at the same time, when thefollower 33 reaches one end of the bolt 17 and moves the latterlongitudinally, with the result of placing the spring 19 under greatcompression, the central core is caused to expand or tend tovexpand withthe result of greatly increasing the frictional resistance oered by theparts to the inward movement of the draw bar and lthe yoke carriedthereby.

From the foregoing, it is thought that the construction, operatlon andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetailsof construction may be resorted tdwithout departing from thespirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a friction draw gear, the combination with the draw bar, of afriction mechanism including an internal, sectional expansible core, acore expanding device located within the core, means for'yieldinlyresisting movement of said device, an plurality of sectional ring wedgesoperated and arranged to encircle and grip `the core.

2. In a friction draw gear, the combination with the draw bar, of afriction mechanism colnprising an expansible core, a core expandingdevice movable longitudinally within the core, and a plurality ofsectional rings wedging one 'u on the' other and arranged to encircle angrip the core.

3. In a friction draw gear, the combination with the draw bar, of afriction mechanism comprising a friction case, a central expansiblecore, core expanding means operated upon movement of the draw bar, andalternating compression. and expansion devices arranged side by side andencircling the core between the latter and the friction case, saiddevices being also'operated upon movement of the draw bar.

4. In a friction draw gear, the combination with the draw bar, of afriction mechanism comprising a friction case, a 'central expansiblecore, core expanding means operated upon movement of the draw bar, andalternating compression and expansion ldevices in the form of sectionalrings wedging one upon the other and encircling the core between thelatter and the friction case, said devices being also operated uponmovement of the draw bar.

5. In a structure of the character set forth, the combination with anexpansible core formed of sections and having a central bore and taperedcounterbores, of a vdraw-baroperated bolt passing vthrough the bores,cones arranged on the bolt and bearing against the tapered Walls of thecounterbores, springs located on the bolt a compressible sectionalfriction ring surrounding the core, a draw gear having a yoke disposedlongitudinally of and surrounding the core, and means operated by thedraw gear for compressing the ring.

6. In a structure of the character set forth, the combination with atubular friction case, of a core disposed centrally and longitudinallyWithin the same, and comprising sectionsthat permit the expansion of thecore, said core having a central bore and tapering counterbores, a boltpassing through the bore and counterbores, cones located on the boltandbearing lagainst the tapered walls of the counterbores, coiledsprings on the` bolt, a series `of sectional friction rings surroundingthe cores within the case, the alternate rings being respectivelylexpansible and contractible and having complemental inclined faces,buffer springs'arran ed within the case around the cores an 'bearingagainst the innermost rings, a draw gear having a draw gear yokearranged longitudinally of and surrounding the case, and a followerarranged Within the yoke and bearing against the outermost ring.

In testimony whereof I hereunto aix my slgnature in the presence of twowitnesses. l

FRANK M. SNYDER.

Witnesses:

J. W. HEUCH, JOHN L. HERR.

